<template>
	<view>
		<my-search @click='gotoSearch'></my-search>
		<view class="scrool-view-container">
			<!-- 左侧的滑动区 -->
			<scroll-view scroll-y="true" class="left-scroll-view" :style="{height: wh + 'px'}">
				<block v-for="(item,i) in cateList" :key='i'>
					<view :class="['left-scroll-view-item',i === active ? 'active' : '']" @click="activeChanged(i)">{{item.cat_name}}</view>
				</block>
			</scroll-view>
			<!-- 右侧的滑动区域 -->
			<scroll-view class="right-scroll-view" scroll-y :style="{height: wh + 'px'}" :scroll-top="scrollTop">
			  <view class="cate-lv2" v-for="(item2, i2) in cateLevel2" :key="i2">
			    <view class="cate-lv2-title">/ {{item2.cat_name}} /</view>
				<view class="cate-lv3-list">
				      <!-- 三级分类 Item 项 -->
				      <view class="cate-lv3-item" v-for="(item3, i3) in item2.children" :key="i3" @click="gotoGoodsList(item3)">
				        <!-- 图片 -->
				        <image :src="item3.cat_icon"></image>
				        <!-- 文本 -->
				        <text>{{item3.cat_name}}</text>
				      </view>
				    </view>
			  </view>
			</scroll-view>
		</view>
	</view>
</template>

<script>
	export default {
		data() {
			return {
				wh:0,
				cateList:[],
				active:0,
				cateLevel2: [],
				scrollTop: 0
			};
		},
		mounted() {
			const sysInfo = uni.getSystemInfoSync()
			this.wh = sysInfo.windowHeight -50
		},
		onLoad() {
			this.getCateList()
		},
		methods:{
			async getCateList(){
				const { data:res } = await uni.$http.get('/api/public/v1/categories')
				if(res.meta.status !== 200) return uni.$showMsg()
				this.cateList = res.message
				this.cateLevel2 = res.message[0].children
			},
			activeChanged(i){
				this.active = i
				this.cateLevel2 = this.cateList[i].children
				this.scrollTop = this.scrollTop === 0 ? 1 : 0
			},
			gotoGoodsList(item3) {
			  uni.navigateTo({
			    url: '/subpkg/goods_list/goods_list?cid=' + item3.cat_id
			  })
			},
			gotoSearch(){
				console.log('ok')
			}
		}
	}
</script>

<style lang="scss">
	.scrool-view-container{
		display: flex;
	}
	.left-scroll-view{
		width: 200px;
	}
	.left-scroll-view-item{
		line-height: 60px;
		background-color: #f7f7f7;
		text-align: center;
		font-size: 12px;
		&.active {
			background-color: #ffffff;
			position: relative;
		
			// 渲染激活项左侧的红色指示边线
			&::before {
				content: ' ';
				display: block;
				width: 3px;
				height: 30px;
				background-color: #c00000;
				position: absolute;
				left: 0;
				top: 50%;
				transform: translateY(-50%);
			}
		}
	}
	.cate-lv2-title {
	  font-size: 12px;
	  font-weight: bold;
	  text-align: center;
	  padding: 15px 0;
	}
	.cate-lv3-list {
	  display: flex;
	  flex-wrap: wrap;
	
	  .cate-lv3-item {
	    width: 33.33%;
	    margin-bottom: 10px;
	    display: flex;
	    flex-direction: column;
	    align-items: center;
	
	    image {
	      width: 60px;
	      height: 60px;
	    }
	
	    text {
	      font-size: 12px;
	    }
	  }
	}
</style>
